---
id: flask-openapi3-swagger
version: "5.31.0"
license: MIT
license_treatment: permissive
maintenance: active
---

# flask-openapi3-swagger — Provide Swagger UI for flask-openapi3.

License: permissive · Maintenance: active · Downloads: 396.1K/mo

## What it is and what it does

flask-openapi3-swagger is a plugin that adds Swagger UI to flask-openapi3 applications, transforming OpenAPI specifications into an interactive, browser-based interface for exploring and testing APIs. It sits on top of flask-openapi3 and requires that package as a runtime dependency, providing one of several optional UI templates available in the flask-openapi ecosystem.

The package is lightweight and actively maintained. It integrates directly with flask-openapi3's UI template system, allowing developers to enable Swagger documentation without writing additional code beyond a standard installation. The plugin is part of a broader suite of UI options (Redoc, RapiDoc, RapiPdf, Scalar, Elements) that can be mixed and matched depending on documentation needs.

Use it for:

- Enable interactive API documentation for REST endpoints defined in a flask-openapi3 application
- Allow API consumers to test endpoints directly from the browser without external tools
- Generate and serve auto-updated API documentation from OpenAPI schemas
- Provide a standard UI for internal or public API exploration during development

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides Swagger UI integration for flask-openapi3, enabling interactive API documentation and testing directly in a web browser.

Yes, if you are already using flask-openapi3 and want Swagger UI for your API documentation. The low install friction, permissive MIT license, active maintenance, and zero known vulnerabilities make it a straightforward choice. Install it only if flask-openapi3 is already in your project; it is an optional plugin, not a standalone tool.

## Install

pip install flask-openapi3-swagger
uv add flask-openapi3-swagger
poetry add flask-openapi3-swagger

## Installing flask-openapi3-swagger

Before you install: Low friction install with a single runtime dependency. Active maintenance as of 2026-08-14 with recent release activity.

License in practice: MIT license permits free use, modification, and distribution with minimal restrictions—suitable for most commercial and open-source projects.

Quickstart:

pip install flask-openapi3-swagger

from flask_openapi3 import OpenAPI
app = OpenAPI(__name__)

@app.get('/hello')
def hello():
    return {'message': 'Hello'}

if __name__ == '__main__':
    app.run()

Requires Python 3.8 or later; flask-openapi3 must be installed and configured first.

Verify before relying:

- Whether Swagger UI can be customized beyond what the base flask-openapi3 framework provides
- Performance characteristics when serving large or complex OpenAPI schemas
- Compatibility with specific versions of flask-openapi3 beyond the stated dependency

## Package facts

- License: MIT (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 396.1K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

swagger ui for flask, openapi documentation ui, interactive api docs, flask api explorer, openapi swagger integration, rest api documentation, api testing interface, api-documentation, swagger-ui, flask-plugin

[View on SkillFed](https://skillfed.io/packages/flask-openapi3-swagger) · [View on PyPI](https://pypi.org/project/flask-openapi3-swagger/)